class Byebug::CatchCommand

def description
  %{cat[ch]\t\tsame as "info catch"
    cat[ch] <exception-name> [on|off]
    \tIntercept <exception-name> when there would otherwise be no handler.
    \tWith an "on" or "off", turn handling the exception on or off.
    cat[ch] off\tdelete all catchpoints}
end

def execute
  excn = @match[1]
  return info_catch unless excn
  if not @match[2]
    if 'off' == @match[1]
      Byebug.catchpoints.clear if
        confirm("Delete all catchpoints? (y or n) ")
    else
      print "Warning #{@match[1]} is not known to be a Class\n" unless
        debug_eval "#{@match[1]}.is_a?(Class)", get_binding
      Byebug.add_catchpoint @match[1]
      print "Catch exception #{@match[1]}.\n"
    end
  elsif @match[2] != 'off'
    errmsg "Off expected. Got #{@match[2]}\n"
  elsif Byebug.catchpoints.member?(@match[1])
    Byebug.catchpoints.delete @match[1]
    print "Catch for exception #{match[1]} removed.\n"
  else
    return errmsg "Catch for exception #{@match[1]} not found\n"
  end
end

def names
  %w(catch)
end

def regexp
  /^\s* cat(?:ch)?
       (?:\s+ (\S+))?
       (?:\s+ (off))? \s* $/ix
end